<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>标题</title>
</head>
<body>
    <div>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quaerat aperiam iure culpa labore explicabo fugiat! Doloremque, aut id! Consequuntur fugit odio, quod nihil veniam necessitatibus eligendi vero corporis laudantium fuga.</div>
    <div></div>
</body>
<script>
    console.log(a);
    var a = 1;
    console.log(a);
    function a(){
        console.log(2)
    }
    console.log(a);
    var a = 3;
    console.log(a);
    function a(){
        console.log(4);
    }
    a();
    console.log(a);


</script>
</html>